Carriage returning and paper feeding appliance for typewriters



NOV. 25, 1952 TRULLEMANS 2,619,214

CARRIAGE RETURNING AND PAPER FEEDING APPLIANCE FOR TYPEWRITERS Filed Feb. 14, 1950 3 Sheets-Sheet l Nov. 25, 1952 E. TRULLEMANS 2,619,214

CARRIAGE RETURNING AND PAPER FEEDING APPLIANCE FOR TYPEWRITERS Filed Feb. 14, 1950 3 Sheets-Sheet 2 gu V 29 Filed Feb. 14, 1950 5 Sheets-Sheet 3 NOV. 25, 1952 E TRULLEMANS 2,619,214

CARRIAGE RETURNING AND PAPER FEEDING APPLIANCE FOR TYPEWRITERS Patented Nov. 25, 1952 UNITED STATES rem OFFICE CARRIAGE RETURNING AND PAPER FEED- ING APPLIANCE FOR TYPEWRITERS Eugene Trullemans, Lausanne, Switzerland 9 Claims.

This invention relates to an appliance designed for the return of the carriage of a typewriter and for the forward feeding of the paper, and comprises an electric motor driving a drum upon which is wound a cable secured to the carriage.

This appliance is characterized by a clutch or coupling arranged between the motor and the carriage and designed to transmit a predetermined maximum torque, this coupling comprising two parts which are movable relatively to one another and which are displaced when the torque exceeds the said maximum, thus producing the disengagement of the coupling, these parts being connected with an electric switch controlling the motor, all in such a way that the excess pull on the cable due to the arrival of the carriage against a stop at the end of its stroke produces the disengagement of the coupling and the stoppage of the motor.

One form of construction of the invention is illustrated by way of example in the accompanying drawings, in which:

Figure 1 is a diagrammatic plan view of a typewriter equipped with the present appliance;

Figure 2 is a profile View on a larger scale of a detail of Figure 1;

Figure 3 is a horizontal section of the appliance, the plane of section passing through the drum on which the cable is wound;

Figure 4 shows a detail in sectional elevation on the line IVIV in Figure 3;

Figure 5 is a view of one of the walls of the frame of the appliance and of the parts that are fixed thereto;

Figure 6 shows a section of a detail on the line VIVI in Figure 3;

Figure 7 is a section on the line VII-VII in Figure 6; and

Figures 8 and 9 are views in section, corresponding to Figures 6 and '7 respectively, showing a modification.

The writing machine illustrated in Figure 1 is denoted by I, and its carriage by 2. The appliance designed for returning the carriage is denoted by 3. It is detachably fixed to the frame of the machine by a flange, not shown. This appliance comprises a motor 4, actuating a drum 5 (Figure 3), upon which is wound a cable 6. This cable may be of metal, nylon, or any other strong and flexible material. This cable is connected to the line-spacing lever I I of the machine, either directly or through the medium of an additional device, according to the type of machine upon which the appliance is mounted. Here the cable is hooked on to a hook 1a, pro- 2 vided on a lever 1 (Figure 2), pivoted at 8, and controlling, by means of a peg 9, an arm in fixed to the line-spacing lever II. This arrangement enables the return of the carriage and the changing of the line, that is to say, the forward feeding of the paper, to be effected simultaneously.

In Figure 3, the end of the shaft I2 of the motor is visible. This shaft, by means of a screwdriver coupling l3, drives a shaft M carrying a worm, not represented, co-operating with a wheel I5 keyed on to a sleeve it, which turns in bearings I! carried by a part I 8a of the frame I 8 of the apparatus, The sleeve It carries a wheel I!) provided with a spur 20 designed to cooperate with spurs 2| on a coupling disc 22. This disc is rigid with a barrel 22a sliding upon a shaft 23. The latter is likewise slidingly mounted upon two trunnion rods 24 fixed to the frame IS. A helical spring 25 bearing against a stop 26 fixed to the shaft 23 tends to press the disc 22 against a second coupling disc denoted by 2?. The disc 22 is provided with three dogs 23 spaced apart at angles of degrees, and designed to enter corresponding cavities 29 in the disc 21. These dogs 28 and these cavities 29 have contact surfaces 38 at an inclination to the axis of rotation, as shown in Figure '7. The disc 2'! is rigid with a sleeve 3!, upon which the drum 5 is r0- tatably mounted, and to which is fixed a small plate 32. This plate carries a peg 33, to which is fixed the end of a spiral spring 34, the other end of which is fixed to a flange 5a of the drum 5. The disc 27 therefore drives the drum 5 resiliently through the medium of the spring 34. A screw 35 in the drum 5 extends into an arcuate slot 35 in the disc 21 and thus limits the relative displacement between the disc 2! and the drum 5. The sleeve 31 carrying the drum 5, and also the discs 22 and 21, are axially movable with the shaft 23.

One wall of the frame, denoted by [8b, is represented in Figure 5. This wall carries a rocking lever 31 pivoted upon a pin 38, with which it is rigid. The pin 38 is perpendicular to the axis of rotation of the drum. The lever 3! carries two pegs 39 and 40, situated one on each side of the drum 5 and of the disc 21. The oscillations of the lever 31 thus produce axial displacements of the drum 5 and of the disc 21, while conversely these axial displacements produce oscillations of the lever. A jumper 4| pressed against the lever 31 by a spring 42 establishes two stable positions of the lever. The lever 37 has a lug 37a actuating an oscillating cam 43, which closes an electrical contact 44 supplying current to the ner: The various parts being in the positions illustrated in the drawings, a..pressure.exerted upon the lever 48 produces a rotation ofthe lever 31 in the direction denoted by the arrow 49;

which on the one hand producestheclosuret of:

the contact 44 and the starting of themotor.

4, and on the other hand the displacementby,

means of the peg 39, of the drum 5andofthe shaft 23 with all that it carries. The spursz2l then enter the path of the spur 20, and the disc 22. is rotated. Thev dogs- 28 drive the disc 21, which is rigidv with the sleeve 3|. is then driven through the medium ofthe spring 34, andthe cable 6 winds on-tov the drum. The.

latter may be provided with a helical groove ensuring. the regular winding-of the cable. The carriageisthen displaced by the cablein the direction ofthe arrow- 50 in-Figure l. Whenit reaches the end of its travel it strikes against a stop and the tensionof the. cable suddenly increases. surfaces-30 between the dogs 28'and their cavi-- ties- 29, the increase inthe torque to be transmitted produces the displacement of the disc 21- in the direction of. the arrow 66. Thedogs 28' come out of the cavities 29, and the disc 2?, aswell as the drum 5; areno longer. actuated. At the same time the displacement of. the disc and of the drum produces the opening of the contact 44- and the stoppage of the motor. By

A device is provided which'keeps the cable 6- taut. This device shown in Figure-4, comprises abarrel of which-the hub, denoted-by 5|,is fixed tothe part l8a: of the framel8, and: of which the cage, denoted by 52:, carries a: gear. wheel- 53; meshing with a pinion 54'carriedby the shaft 23.

' A spiralspring SSisfiXed-at one end to the hub 5| and at the. other. end to the-cage 52. This spiral-spring stretches to a greater or less extent according to the positionoccupied by the care riage, and keeps the cable 6 taut.

Figures 8 and 9 illustrate a modification of the coupling device. disc carrying the dogsis denoted; by, 5B, and the disc provided with the cavities-by 51*. The cavities are denoted by 58, andthe dogs by 60. Thecontact surfaces between the dogs andthe cavities, denoted by 6|, are parallel to the-axis of rotation. The disc 56 is furthermore provided with nipples 62, which enterthe cavities 58, and are each provided with a surface 63 at an inclination to the axis-of rotation. Pegs 64,.rigid. with the. drum 5 and parallel to the axis, enter thecavities 58. When the torque to be. transmitted exceeds a certain. value, a: relative. displacement is produced between. the drum- The drum 5 Due to the obliquity of the contact.

In this modification the.

5 and the disc 5'! against the resistance of the spiral spring 34. In relation to the disc 51, the pegs 64 are displaced in the direction of the arrow 65. Then they come into contact with the surfaces 63, they push the nipples 62 out of the cavities, producing a relative axial displacement of the two discs, so that the dogs 60 come out of the cavities 58, anddisengagement takes place.

The invention is of course not limited to the embodiment here described. Several types of couplings couldespecially be used, such as gearcouplings,friction-couplings or electro-magnetic couplings.

What I-claim is:

1. Anappliance for. returning the carriage of a: typewriter. and feeding the paper forward, detachably mounted upon the frame of the typewriter, comprising a cable attached to the carriage, a drum upon which is wound said cable, an electric motor for driving; said drum-a couplinginterposed between; said motor and said drumanddesigned to transmit a predetermined maximum torque, this coupling comprising; two

members movable relatively to oneanother and arranged-in such a-mannerthatone is displaceable relatively to'the-other to produce'the dis-,

engagement of the coupling when the torque exceeds the said: maximum; and an electricalswitch controlling the motor,- said.switch-v being. connected with the 'displaceable one, ofisaid-mem bers, whereby the excess pull on the, cable due to the arrival of the carriage against anend- 0f trave1'stop produces the disengagement'of the coupling and the stoppage ofpthemotor;

2; An appliance for simultaneously returning theicarria'gei of a typewriter andfeeding thepaperforward; detachably mounted upon;theframe of the typewriter, comprising. a. cable. attached to the line; spacing control lever of the typewriter,

adrumupon which is wound isaidcable, anelec.

tric motor for driving said:dr.um, a coupling-interposed betweensaid motor-and said drum and designed: to. transmit; a: predetermined" maximum torque, this coupling comprising two members movable relatively to one another. and arranged in. such-a manner that oneis displaceablerelatively to theother to produce the disengagement.

to transmit a. predetermined maximum torque,v

this-coupling comprisingtwo discs, a-spring tending to press said discsone against the other, one

of. these two discs, being provided with at least one. dog and the other with at leastone cavity,

saidzdogbeing;designed to enter said cavity underthe-actioneof. said' spring and to-leavesaid cavity when the torque exceeds the said maximum, thus producing the disengagement of the coupling,

andan electrical switch controlling the motor, said switch being connected with one: ofsaid discs, whereby the-excess-pull on the cabledueto-the arrival-of-the carriageagainst an end-of,-

travel stop produces the disengagement of the coupling and the stoppage of the motor.

4, An appliance as claimed in claim 3 in which said dog is equipped with a plane which is inclined to the axis of rotation and in which the cavity is equipped with a corresponding plane designed to cooperate with the inclined plane of the dog in such a way that when the torque exceeds the said maximum the pressure of these two inclined planes against one another will produce a relative axial displacement of the two discs, thus bringing the dog out of the cavity, and thereby disengaging the clutch.

5. An appliance for returnin the carriage of a typewriter and feeding the paper forward, comprising a cable attached to the carriage, a drum upon which is wound said cable, an electric motor for driving said drum, a coupling interposed between said motor and said drum and designed to transmit a predetermined maximum torque, this coupling comprising two discs coaxial with said drum, a spring tending to press said discs one against the other, one of these two discs being provided with at least one dog and the other with at least one cavity, said dog being designed to enter said cavity under the action of said spring and to leave said cavity when the torque exceeds the said maximum, thus producing the disengagement of the coupling, a spiral spring connecting one of said discs with said drum in such a way that this disc resiliently drives the drum and that the impact of the carriage against an end-of-travel stop is absorbed, and an electrical switch controlling the motor, said switch being connected with one of said discs, whereby the excess, pull on the cable due to the arrival of the carriage against the end-of-travel stop produces the disengagement of the coupling and the stoppage of the motor.

6. An appliance as claimed in claim 5, in which the second of the two discs is provided with means for coupling with a member constantly driven by the motor, in such a way that this disc is coupled to or uncoupled from the said member according to the axial position that it occupies.

'7. An appliance as claimed in claim 5, in which the drum is actuated by the disc provided with the cavity, the planes of contact between the dog and the cavity are parallel to the axis of rotation, and the drum is rigid with a peg parallel to the said axis, this pe entering the cavity in order to co-operate by means of its end with a plane which is inclined to the axis of rotation presented by the disc, in such a, way that when the torque exceeds the said maximum a relative angular displacement of the drum and disc is produced, which actuates it against the resist ance of the spiral spring, that this relative displacement produces the displacement of the two discs by the co-operation of the peg and the inclined plane, and that the dog is pushed out of the cavity, which produces the disengagement of the clutch.

8. An appliance for returning the carriage of a typewriter and feeding the paper forward, comprising a cable attached to the carriage, a drum upon which is Wound said cable, an electric motor for driving said drum, a coupling interposed between said motor and said drum and designed to transmit a predetermined maximum torque, this coupling comprising two discs, a spring tending to press said discs one against the other, one of these two discs being provided with at least one dog and the other with at least one cavity, said dog being designed to enter said cavity under the action of said spring and to leave said cavity when the torque exceeds the said maximum, thus producing the disengagement of the coupling, an electrical switch controlling the motor, said switch being connected with one of said discs, whereby the excess pull on the cable due to the arrival of the carriage against an end-of-travel stop produces the disengagement of the coupling and the stoppage of the motor, a rocking lever pivoted upon the frame of the appliance and of which the axis of oscillation is perpendicular to the axis of rotation of the coupling, said electrical switch being controlled by said lever, and two nipples carried by said rocking lever and situated one on each side of one of the two discs, in such a way that this lever oscillates, when axial displacements of said discs occur.

9. In an appliance as claimed in claim 8, a manipulating member which enables the rocking lever to be actuated manually.

EUGENE 'I'RULLEMANS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,160,251 Helmond Ma 30, 1939 2,179,021 Read Nov. 7, 1939 

